The philosophy of occupational therapy has changed over the history of the profession. The philosophy articulated by the founders owed much to the ideals of romanticism, pragmatism and humanism which are collectively considered the fundamental ideologies of the past century.
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material found in all living organisms and is found in the nucleus of eukaryotes and in the chloroplasts and mitochondria. In prokaryotes, the DNA is not enclosed in a membranous envelope.
The building blocks of nucleic acids are called nucleotides. There are only four types of nucleotides. This is one of the reasons why nucleic acids seem relatively simple compared to proteins. Each nucleotide has a sugar that forms a ring. Bonded to one part of this sugar is something called a phosphate group.